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Reddit stock jumps on inclusion in S&P 500
S&P Dow Jones Indices said Reddit will join the benchmark as AvalonBay leaves after an acquisition-related removal.
On Tuesday, August 18, 2026, Reddit Inc. will join the S&P 500, replacing AvalonBay Communities Inc. effective prior to the opening of trading.
Equity Residential is acquiring AvalonBay Communities in a deal expected to be completed soon, creating the S&P 500 vacancy that Reddit will fill.
Separately, Sun Communities Inc. will replace Webster Financial Corp. in the S&P MidCap 400 effective prior to the opening of trading on Thursday, August 20, 2026.
Following the merger, the combined entity will be renamed Vivmark Residential and remain in the S&P 500, while Banco Santander acquires Webster Financial.
Since Charles Dow invented the first index in 1884, S&P Dow Jones Indices has maintained rule-based methodologies that determine large-cap status for companies like Reddit.